| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 81.0 | 81.0 |
| firefox esr | < 78.3 | 78.3 |
| thunderbird | < 78.3 | 78.3 |
When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free. This occurs because the function APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator invalidation rules. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
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